Water cup



FIG. 1 is a front perspective view of a water cup showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof, the right side view is mirror image of left side view; and,

FIG. 6 is a top view thereof.

Broken lines in the drawings depict portions of the water cup that form no part of the claimed design. 

CLAIM The ornamental design for a water cup, as shown and described. 